The lewis representation above depicts a reaction between a halogen (blue) and a main-group element from group (red). in this representation, each y atom needs electron(s) to complete its octet, and gains these electrons by forming bond(s) with atoms of x . there are unshared electron pair(s) and bonding electron pair(s) in the product molecule. the bonds in the product are

Attached in attachment.

Y is from Group 17. It needs 1 electron to complete its octet. There are total 6 lone pairs in molecule and 1 bond pair. The bond is covalent bond.

In the picture given, we can see that it contains Lewis Dot structure of two elements X and Y. The X is said as a halogen and also correspondingly has 7 electrons in its outermost shell. The Y isn't mentioned which element it is, but similarly to X it also has 7 electrons in its outermost shell. So it is also a halogen. The group of the halogen is group 17. So Y belongs to group 17.

As the element has 7 electrons in its outermost shell, so it needs 1 electron to fulfill it's octet. It forms a covalent bond with X from where it gets 1 electron via sharing.

So now, there are three unshared electron pair of X and 3 unshared electron pair of Y. So a total of 6 unshared electron pair and 1 bond pair of electron between X and Y.

it is the most commonly accepted one